Introduce getDiffProps for <View> (#45552)#64
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Summary: Pull Request resolved: facebook#45552 In this diff I'm overriding the getDiffProps for ViewProps. The goal is to verify what's the impact of calculating diffs of props in Android, starting with ViewProps. Once we verify what are the implication we will automatic implement this diffing. The full implementation of this method will be implemented in the following diffs changelog: [internal] internal Reviewed By: NickGerleman Differential Revision: D59969328 fbshipit-source-id: ce141528581e46e9ced4175dca040ddf8bed5ddb
ghost
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It's related to PR #61, which enables the feature flag (only on the new arch). |
bdbaraban
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May 22, 2025
Summary: Pull Request resolved: facebook#45552 In this diff I'm overriding the getDiffProps for ViewProps. The goal is to verify what's the impact of calculating diffs of props in Android, starting with ViewProps. Once we verify what are the implication we will automatic implement this diffing. The full implementation of this method will be implemented in the following diffs changelog: [internal] internal Reviewed By: NickGerleman Differential Revision: D59969328 fbshipit-source-id: ce141528581e46e9ced4175dca040ddf8bed5ddb Co-authored-by: David Vacca <dvacca@meta.com>
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TL;DR
This cherry-picks this PR on top of our RN 0.78 branch to fix some rendering issues happening on new arch:
Details
When using FlashList with new arch on our RN 0.78 build we were seeing weird layout bugs:
after testing we found that on RN 0.79 these issues don't happen. I ran a bisect and found that this commit fixes the issue.
Weird details
Now, its odd that this commit is fixing the issue, as the function
getDiffPropsis nowhere called during runtime! (There is one call site inandroid/FabricMountingManager.cppbut thats behind a feature flag that is false).My best assumption is that in release mode (the only place where the bug happens) some optimization flags are applied which cause some corruption (messing with the vtable as this is a virtual function?). In debug those flags aren't applied and so the bug doesn't happen.